I can remember seeing an article on that engine in a book about machines that I checked out from my local library some 25 years ago. The article did have pics and a small riteup about the eng., they said that it had a high hp to weight ratio, but it wasnt very "throttlable" and was very noisy. Since then I have been looking for additional information about it and have searched the web and the librarys but havent found anything. One place to start would be the Mallory (batteries, electronics) company, because I think I remember reading that they owned it. Im sure that it is proprietary information,but if its been around that long, the information is in public domain. I sure would be interested in any info you might want to share on it. Seems like it would make a perfect compact diesel engine.